ABB 07KR51-HSB Hot Stand-By functionalities

Presentation 

The 07KR51-HSB is based on the basic 50 series central units. This version of 50 series central unit with redundancy firmware can be used in hot stand-by functionalities on CS31. The meaning is that a hot stand-by remote central unit can handle directly all inputs and outputs on CS31 bus if the hot stand-by master shuts down, without any discontinuity on the process. The hot stand-by remote central unit is only a reading of all inputs on the CS31 bus and it executes its own program without any output assignment. The user program in both central units can be different (for example to implement a shutdown sequence). In case of an error in the hot stand by master central unit, the hot stand-by remote central unit will take over within a maximum of 3 cycle times.

General set-up rules

In order to assure this functionality, the architecture must have one 07KR51-HSB central unit configured in master hot stand-by, and one slave 07K51-HSB central unit configured in slave remote hot stand-by.

Each 07KR51-HSB central units incorporate a specific number of binary inputs / outputs. And it is possible, to increase this number of binary or analog inputs / outputs, by addition of different extensions directly connect to the 07KR51-HSB central units.

These extensions are the same that used with standard 40 and 50 series central units. (See references inside technical documentation – 1SBC260400R1001)

It is possible to use decentralized inputs / outputs units via the CS31 twisted pair:

-  ICMK14F1 or ICMK14N1 remote units + its own basic extensions

- 07KR51 or 07KT51 basic central units configured in slave mode.

-   DC551 remote units + its own basic extensions

It is not possible to use the following function blocks (MT_CS31, MR_CS31, ST_CS31 and SR_CS31) under AC31GRAF programming software, to simplify the communication between the 07KR51-HSB master central unit and basic slave central units.

In order to use the S500 remote units DC551 + its own basic extensions, it is necessary to used specific function blocks in order to configure the inputs /outputs parameters. These function blocks are only available with AC31GRAF programming software.

The cycle time of both the central units, master and slave HSB, have to be set exactly similar for a perfect synchronisation. It is not recommended to load more than 50% of the memory.

The front (see Figure)

 1 - Location for the DIN rail 

 2 - Plate fixture with unit earthing 

 3 - Lock for DIN rail mounting 

 4 - Location for external dual connector 

 5 - Location for the cabling connectors: - of 24 V d.c. output power for the inputs (available only for the remote units with 120 / 230 V a.c. power) - of the inputs 

 6 - Visualization set for the status of the 8 inputs / 6 outputs   

 7 - Location of the connector for the connection of input/output extensions 

 8 - Location of the cabling connectors: - the serial port for programming or  communication ASCII / MODBUS® - connector for the central unit power supply cabling  - connectors for the outputs cabling   

 9 - Location of the addressing rotate selectors (see enlargement) 

 10 - Unit status visualization area: - POWER: power on - RUN: Blinking indicates the valid message received - ERR: On indicates error(s) present and blinking indicates configuration action

Enlargement of item 9 without cover (see Figure)

1 - Potentiometer whose value is read into the IW62.01 variable by the program (value of 0 to 150 in the program) 

2 - Screwdriver for potentiometer adjustment   

3 - Potentiometer whose value is read into the IW62.00 variable by the program (value of 0 to 150 in the program) 4 - Central unit program ON/OFF switch